<style type="text/css">
#test{ background:#64AADB;position:absolute; top:262px; left:50%; width:540px; height:80px; margin-left: -270px; border-radius:5px;}
</style>
<iframe src="{$url}" width="100%" height="100%" frameborder="0"></iframe>
<div style="width:1440px; text-align:center">
  <div id="test"><img src="__PUBLIC__/admin/images/express.jpg" width="100%" /></div>
</div>